using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using ChartForgeX.Core;
using ChartForgeX.Primitives;
using ChartForgeX.Rendering;
using ChartForgeX.Themes;
using ChartForgeX.Topology;
using ChartForgeX.Typography;
using ChartForgeX.VisualArtifacts;
using ChartForgeX.VisualBlocks;

var mode = VisualThemeMode.Dark;
var theme = VisualTheme.Graphite();
var model = PieRecipe.Create("wide", mode);
var context = new VisualRenderContext(
    new VisualLayoutOptions(new VisualSize(800, 440)), theme, mode,
    new VisualFrame("Revenue by service", "Explore the data, then download the chart", showLegend: null, showSurface: false));
var prepared = model.Prepare(context);
File.WriteAllText("visual.svg", prepared.ToSvg());
File.WriteAllBytes("visual.png", prepared.ToPng());
File.WriteAllText("visual.html", prepared.ToArtifact("example", VisualArtifactKind.Chart).ToHtmlPage());

/// <summary>Revenue shares with optional slice labels, an offset slice and a fill pattern.</summary>
public static class PieRecipe {
    /// <summary>Creates revenue by service; the options variant labels and separates selected slices.</summary>
    public static Chart Create(string variant = "wide", VisualThemeMode mode = VisualThemeMode.Light) {
        if (variant is not ("wide" or "compact" or "sparse" or "options" or "compact-options"))
            throw new ArgumentOutOfRangeException(nameof(variant));
        var revenue = new ChartSeries(new ChartSeriesId("revenue"), "Revenue", ChartSeriesKind.Pie, Observations(variant));
        var chart = Chart.Create().WithXLabels("Subscriptions", "Consulting", "Support", "Licenses", "Training", "Other")
            .AddSeries(revenue).WithValueFormat(ChartValueFormat.Number("0.##", System.Globalization.CultureInfo.InvariantCulture));
        if (variant == "options") {
            chart.WithDataLabels().WithPieSliceLabelContent(ChartPieSliceLabelContent.Label);
            revenue.WithPointSliceOffset(0, .12).WithPointFillPattern(1, ChartFillPattern.Crosshatch);
        }
        return chart;
    }

    private static ChartPoint[] Observations(string variant) => (variant == "sparse" ? new[] { 1, 3, 6 } : Enumerable.Range(1, 6))
        .Select(index => new ChartPoint(index, 20 + index * 7 % 29)).ToArray();
}